US20090219722A1 - Ceramic light emitting device - Google Patents
Ceramic light emitting device Download PDFInfo
- Publication number
- US20090219722A1 US20090219722A1 US12/039,619 US3961908A US2009219722A1 US 20090219722 A1 US20090219722 A1 US 20090219722A1 US 3961908 A US3961908 A US 3961908A US 2009219722 A1 US2009219722 A1 US 2009219722A1
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- US
- United States
- Prior art keywords
- light emitting
- emitting device
- peripheral wall
- mounting portion
- reflective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/483—Containers
- H01L33/486—Containers adapted for surface mounting
Definitions
- Ceramic materials may be used as substrates for light emitting devices, such as light emitting diodes.
- the ceramic material provides good thermal properties for the light emitting devices.
- the ceramic material may be formed as a well, wherein a light emitter is located on the bottom of the well. Although ceramic materials have good thermal properties, they do not reflect light well.
- a reflective plating may be used on the walls of the well to reflect light emitted by the light emitter.
- the well may be filled with a transparent material, such as silicon.
- a transparent material such as silicon.
- silicon and other transparent materials do not adhere well to the reflective material and typically delaminate, which may damage the light emitter or leads connected to the light emitter.
- FIG. 1 is a top plan view of an embodiment of a light emitting device.
- FIG. 2 is a side, cutaway view of the light emitting device of FIG. 1 .
- Light emitting devices are described herein.
- a top plan view of an embodiment of a light emitting device 100 is shown in FIG. 1 and a side cutaway view of the light emitting device is shown in FIG. 2 .
- the light emitting device 100 includes a substrate 106 with a light emitter 110 located proximate or attached to the substrate 106 .
- the light emitter 110 may be, as an example, a light-emitting diode.
- the substrate 106 is made of a material at least partially comprising ceramic.
- the substrate 106 includes a reflector portion 112 and a mounting portion 114 , wherein the reflector portion 112 at least partially surrounds the mounting portion 114 .
- the reflector portion 112 may not completely surround the mounting portion 114 .
- the reflector portion 112 is shown as being circular, but it may be any shape.
- the mounting portion 114 may be substantially planar in order to support the light emitter 110 .
- the reflector portion 112 includes an outer peripheral wall 120 and an inner peripheral wall 122 .
- the inner peripheral wall may have a height of approximately 0.5 millimeters.
- Between the outer peripheral wall 120 and the inner peripheral wall 122 is a reflective surface 126 and an upper surface 128 separated by an edge 130 .
- the edge 130 separates the reflective surface 126 from the upper surface 128 and need not be a rigid angle.
- the combination of the reflective portion 112 and the mounting portion 114 forms a well 134 into which a transparent or semi-transparent material, such as silicon may be placed.
- Leads 140 , 142 may be used to electrically connect the light emitter 110 to traces or other contacts, not shown, on the mounting portion 114 .
- the inner peripheral 122 wall may extend substantially perpendicular to the mounting portion 114 .
- the reflective surface 126 may extend at an angle from the inner peripheral wall 122 . The angle depends on the beam pattern of light to be emitted by the light emitting device 100 . In the embodiment of the light emitting device of FIG. 2 , the intersection of the reflective surface 126 and the inner peripheral wall 122 forms an obtuse angle.
- the light emitter 110 is attached to the mounting surface 114 using conventional mechanisms. For example, an adhesive may be used.
- the leads 140 , 142 supply electric power to the light emitter 110 by way of traces or the like, not shown, on the mounting surface 114 .
- the light emitter 110 When the light emitter 110 is powered, it emits light.
- the direction of the light emission may be in any direction, including toward the reflective surface 126 .
- the well 134 may be filled with a transparent or semi-transparent material.
- the material is silicon.
- other materials may be used to fill the well 134 .
- the silicon or other material filling the well 134 may also serve to diffuse light emitted from the light emitter 110 .
- the diffusion causes light to be emitted in many different directions and may cause some light to be incident with the reflective surface 126 .
- the angle of the reflective surface 126 causes incident light to reflect out of the well 134 .
- the reflective surface 126 is coated with a reflective material 150 , such as gold or silver.
- the reflective material 150 is plated to the reflective surface 126 .
- the reflective material 150 serves to reflect light emitted from the light emitter 110 out of the well 134 .
- the reflective material 150 is not located on the inner peripheral wall 122 . Therefore, the silicon or other material filling the well 134 contacts the ceramic substrate directly. As set forth below, the material filling the well 134 may not adhere well to the reflective material 150 .
- the inner peripheral wall 122 is comprised of ceramic. Therefore, the silicon or other filler material in the well 134 contacts the ceramic of the inner peripheral wall 122 . Silicon or other filler material may delaminate from the reflective material 150 .
- the inner peripheral wall 122 serves to stop the delamination from encountering the proximity of the light emitter 110 .
- the ceramic surface of the inner peripheral wall 122 adheres strongly with the filler material, which stops delamination. Should the delamination get close to the light emitter 110 , it could pull the leads 140 , 142 from either the mounting portion 114 or the light emitter 110 .
- the delamination could also cause the light emitter 110 to become dislodged from the mounting portion 114 .
- the delamination may also enable contaminants in the well 134 , which can cause the aforementioned problems.
- the ceramic on the inner peripheral wall 122 is a surface in which the silicon or other filler material can adhere. Therefore, if the filler material delaminates from the reflective material 150 , the delamination will stop at the inner peripheral wall 122 and will not spread to the vicinity of the light emitter 110 . Accordingly, the aforementioned problems associated with delamination are prevented.
Abstract
Description
- Ceramic materials may be used as substrates for light emitting devices, such as light emitting diodes. The ceramic material provides good thermal properties for the light emitting devices. The ceramic material may be formed as a well, wherein a light emitter is located on the bottom of the well. Although ceramic materials have good thermal properties, they do not reflect light well. In order to improve the intensity of light emitted by the light emitting device, a reflective plating may be used on the walls of the well to reflect light emitted by the light emitter.
- In order to protect the light emitter, the well may be filled with a transparent material, such as silicon. However, silicon and other transparent materials do not adhere well to the reflective material and typically delaminate, which may damage the light emitter or leads connected to the light emitter.
-
FIG. 1 is a top plan view of an embodiment of a light emitting device. -
FIG. 2 is a side, cutaway view of the light emitting device ofFIG. 1 . - Light emitting devices are described herein. A top plan view of an embodiment of a
light emitting device 100 is shown inFIG. 1 and a side cutaway view of the light emitting device is shown inFIG. 2 . Thelight emitting device 100 includes asubstrate 106 with alight emitter 110 located proximate or attached to thesubstrate 106. Thelight emitter 110 may be, as an example, a light-emitting diode. - The
substrate 106 is made of a material at least partially comprising ceramic. Thesubstrate 106 includes areflector portion 112 and amounting portion 114, wherein thereflector portion 112 at least partially surrounds themounting portion 114. In some embodiments, thereflector portion 112 may not completely surround themounting portion 114. Thereflector portion 112 is shown as being circular, but it may be any shape. Themounting portion 114 may be substantially planar in order to support thelight emitter 110. - The
reflector portion 112 includes an outerperipheral wall 120 and an innerperipheral wall 122. The inner peripheral wall may have a height of approximately 0.5 millimeters. Between the outerperipheral wall 120 and the innerperipheral wall 122 is areflective surface 126 and anupper surface 128 separated by anedge 130. Theedge 130 separates thereflective surface 126 from theupper surface 128 and need not be a rigid angle. The combination of thereflective portion 112 and themounting portion 114 forms a well 134 into which a transparent or semi-transparent material, such as silicon may be placed.Leads light emitter 110 to traces or other contacts, not shown, on themounting portion 114. - The inner peripheral 122 wall may extend substantially perpendicular to the
mounting portion 114. Thereflective surface 126 may extend at an angle from the innerperipheral wall 122. The angle depends on the beam pattern of light to be emitted by thelight emitting device 100. In the embodiment of the light emitting device ofFIG. 2 , the intersection of thereflective surface 126 and the innerperipheral wall 122 forms an obtuse angle. - The
light emitter 110 is attached to themounting surface 114 using conventional mechanisms. For example, an adhesive may be used. The leads 140, 142 supply electric power to thelight emitter 110 by way of traces or the like, not shown, on themounting surface 114. When thelight emitter 110 is powered, it emits light. The direction of the light emission may be in any direction, including toward thereflective surface 126. - In conventional light emitting devices, contaminants can enter the well and ruin the
light emitting device 100. For example, the contaminants can erode or break theleads mounting surface 114. In addition, the contaminants can damage thelight emitter 110 in numerous ways. In order to keep contaminants away from thelight emitter 110 and its associated electronics, thewell 134 may be filled with a transparent or semi-transparent material. One example of the material is silicon. However, other materials may be used to fill thewell 134. The silicon or other material filling the well 134 may also serve to diffuse light emitted from thelight emitter 110. The diffusion causes light to be emitted in many different directions and may cause some light to be incident with thereflective surface 126. The angle of thereflective surface 126 causes incident light to reflect out of thewell 134. - The
reflective surface 126 is coated with areflective material 150, such as gold or silver. In some embodiments, thereflective material 150 is plated to thereflective surface 126. Thereflective material 150 serves to reflect light emitted from thelight emitter 110 out of thewell 134. As described in greater detail below, thereflective material 150 is not located on the innerperipheral wall 122. Therefore, the silicon or other material filling the well 134 contacts the ceramic substrate directly. As set forth below, the material filling thewell 134 may not adhere well to thereflective material 150. - As stated above, the inner
peripheral wall 122 is comprised of ceramic. Therefore, the silicon or other filler material in the well 134 contacts the ceramic of the innerperipheral wall 122. Silicon or other filler material may delaminate from thereflective material 150. The innerperipheral wall 122 serves to stop the delamination from encountering the proximity of thelight emitter 110. The ceramic surface of the innerperipheral wall 122 adheres strongly with the filler material, which stops delamination. Should the delamination get close to thelight emitter 110, it could pull theleads mounting portion 114 or thelight emitter 110. The delamination could also cause thelight emitter 110 to become dislodged from themounting portion 114. The delamination may also enable contaminants in thewell 134, which can cause the aforementioned problems. - The ceramic on the inner
peripheral wall 122 is a surface in which the silicon or other filler material can adhere. Therefore, if the filler material delaminates from thereflective material 150, the delamination will stop at the innerperipheral wall 122 and will not spread to the vicinity of thelight emitter 110. Accordingly, the aforementioned problems associated with delamination are prevented.
Claims (21)
Priority Applications (1)
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US12/039,619 US7855398B2 (en) | 2008-02-28 | 2008-02-28 | Ceramic light emitting device package |
Applications Claiming Priority (1)
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US12/039,619 US7855398B2 (en) | 2008-02-28 | 2008-02-28 | Ceramic light emitting device package |
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US20090219722A1 true US20090219722A1 (en) | 2009-09-03 |
US7855398B2 US7855398B2 (en) | 2010-12-21 |
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US12/039,619 Expired - Fee Related US7855398B2 (en) | 2008-02-28 | 2008-02-28 | Ceramic light emitting device package |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110012497A1 (en) * | 2009-07-15 | 2011-01-20 | Kyowa Electric Wire Co., Ltd. | Plating structure and method for manufacturing electric material |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6507049B1 (en) * | 2000-09-01 | 2003-01-14 | General Electric Company | Encapsulants for solid state devices |
US6707069B2 (en) * | 2001-12-24 | 2004-03-16 | Samsung Electro-Mechanics Co., Ltd | Light emission diode package |
US20040211970A1 (en) * | 2003-04-24 | 2004-10-28 | Yoshiaki Hayashimoto | Semiconductor light emitting device with reflectors having cooling function |
US20080217633A1 (en) * | 2007-03-01 | 2008-09-11 | Wu Yin Chang | Light emitting diode structure |
US7456499B2 (en) * | 2004-06-04 | 2008-11-25 | Cree, Inc. | Power light emitting die package with reflecting lens and the method of making the same |
US7514723B2 (en) * | 2001-11-30 | 2009-04-07 | Osram Opto Semiconductors Gmbh | Optoelectronic component |
-
2008
- 2008-02-28 US US12/039,619 patent/US7855398B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6507049B1 (en) * | 2000-09-01 | 2003-01-14 | General Electric Company | Encapsulants for solid state devices |
US7514723B2 (en) * | 2001-11-30 | 2009-04-07 | Osram Opto Semiconductors Gmbh | Optoelectronic component |
US6707069B2 (en) * | 2001-12-24 | 2004-03-16 | Samsung Electro-Mechanics Co., Ltd | Light emission diode package |
US20040211970A1 (en) * | 2003-04-24 | 2004-10-28 | Yoshiaki Hayashimoto | Semiconductor light emitting device with reflectors having cooling function |
US7456499B2 (en) * | 2004-06-04 | 2008-11-25 | Cree, Inc. | Power light emitting die package with reflecting lens and the method of making the same |
US20080217633A1 (en) * | 2007-03-01 | 2008-09-11 | Wu Yin Chang | Light emitting diode structure |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110012497A1 (en) * | 2009-07-15 | 2011-01-20 | Kyowa Electric Wire Co., Ltd. | Plating structure and method for manufacturing electric material |
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US7855398B2 (en) | 2010-12-21 |
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